Bind plugin placeholder directly to v8 instead of over CppBoundClass

components/plugins/renderer/mobile_youtube_plugin.h

Index: components/plugins/renderer/mobile_youtube_plugin.h
diff --git a/components/plugins/renderer/mobile_youtube_plugin.h b/components/plugins/renderer/mobile_youtube_plugin.h
index 80a4f99ca9b8d896a8c01f994fe22b8466eee665..f2a5530f8073866b5c2615b4c9827b45c4881e72 100644
--- a/components/plugins/renderer/mobile_youtube_plugin.h
+++ b/components/plugins/renderer/mobile_youtube_plugin.h
@@ -26,12 +26,8 @@ class MobileYouTubePlugin : public PluginPlaceholder {
   static bool IsYouTubeURL(const GURL& url, const std::string& mime_type);
 
  private:
-  // Opens a youtube app in the current tab.
-  void OpenYoutubeUrlCallback(const webkit_glue::CppArgumentList& args,
-                              webkit_glue::CppVariant* result);
-
-  // WebViewPlugin::Delegate (via PluginPlaceholder) method
-  virtual void BindWebFrame(blink::WebFrame* frame) OVERRIDE;
+  // PluginPlaceholder method
+  virtual void Observe(const std::string& callback) OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(MobileYouTubePlugin);
 };